<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>

</head>
<body>
	a
	<script type="text/javascript">
		function goForwardOne() {
			window.history.go(1);
		}
		
		function goForward() {
			window.history.go(2);
		}
	</script>
	<a href="09b.html">b</a>
	<input type="button" value="前进" onclick="goForwardOne()">
	<input type="button" value="前进2步" onclick="goForward()">
</body>
</html>